Can Java omit sending some headers to HTTP requests?

Question

I am using the HttpConnection class in Java to send HTTP requests.
How to omit unwanted HTTP headers? as:

• User agent
• To accept
• Accept language
• Accept-encoding
• Accept-charset
• Keep-alive
• Connection
• Referer
• If-Modified-Since

Answer 1

If you are talking about HttpURLConnection, you cannot do this. Once the header is set, it cannot be deleted.

Setting the header to zero or blank does not work. I tried this before in Java 5, this led to invalid HTTP headers like

Content-Type: text/html
User-Agent
Content-Length: 123

Answer 2

, setRequestProperty URLConnection

import java.net.URL;
import java.net.URLConnection;
URL url = new URL("http://www.example.com");
URLConnection urlc = url.openConnection();
urlc.setRequestProperty("User-Agent", null);